Critical Error: SiteUrls.Config

Specific Error Message:

Unable to open connection to data provider.

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

Please contact your site administrator. An explanation
for why this error could occur is below.

Community Server expects to find a valid XML file containing all of the
links for a community. By default, this file is located at the root of the
with the name SiteUrls.config.

A common error is that SiteUrls.config included unescaped XML characters, such as
"&" when defining a querystring.